Instanciate Manager with a mandatory Dispatcher

lib/uh/wm/manager.rb

@@ -3,8 +3,9 @@ module Uh
     class Manager
       attr_reader :display
 
-      def initialize display = Display.new
-        @display = display
+      def initialize events, display = Display.new
+        @events   = events
+        @display  = display
       end
 
       def connect

lib/uh/wm/runner.rb

@@ -10,10 +10,10 @@ module Uh
 
       attr_reader :env, :events, :manager
 
-      def initialize env, manager: Manager.new, stopped: false
+      def initialize env, manager: nil, stopped: false
         @env      = env
         @events   = Dispatcher.new
-        @manager  = manager
+        @manager  = manager || Manager.new(@events)
         @stopped  = stopped
       end